Core drill



H. c. JOHANSEN 1,796,950

cons DRILL Filed Oct. 31, 1924 2 Sheets-Sheet l March 17, 1931.

\\\ NM wN March 17, 1931. JOHANSEN 1,796,950

GORE DRILLL Filed Oct; 51, 1924 2 Sheets-Sheet 2 1/396: v5 22 are v 5 fi y as we;

i Q a a1 57 /a ,1 50 15 9 14, LT 15 5% 11/ I W79 Dawn/2w": {j} Harry flefah/amsem Patented Mar. 17, 1231 stares ueaese HARRY C. JOHANSEN, OF MICHIGAN CITY, ENDIANA, ASSTGNOH TO SULLIVAN MA- CHINERY COIYIPAN'IZ', A CGRPORXLIION OF IMASSACHUSETTS CURE DRILL Application filed. October 31, 1924.

My invention relates to core drills.

An object of my invention is to provide an improved core barrel for such a drill. Another object of my invention is to provide an improved combined single and double tube core barrel. Still another object of my invention is to provide an improved core barrel of the combined single and double tube type especially adapted for oil well drilling wherein but a single tube may be used when hard drilling is encountered and a double tube may be used when soft drilling is encountered. A still further object of my invention is to provide an improved double tube core barrel wherein the inner tube is arranged within the outer tube in an improved manner. These and other objects and advantages of my invention will hereinafter more fully appear.

* In the accompanying drawings 1 have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings, Fig. 1 is a longitudinal sectional view through my improved core barrel, the view being taken substantially on line 11 of 2 is an end elevation of the cutting end of my improved core barrel. 3 is a transverse horizontal sectional View taken substantially on line 3-3 of 1. Fig. i is a transverse horizontal sectional view taken substantially on line l4 of Fig. 1.

5 is a view similar to that shown in Fig. 1, with the inner core barrel removed.

Fi 6 is an elevation view of the inner core arrel.

In this illustrative form of my invention I have shown a core barrel generally designated 1 which threadedly engages threads 2 formed on the usual hollow orill rod 3. The y core barrel 1 comprises a head member 4 provided with threads 5 which engage the threads 2 formed on the lower end of the drill rod and this head member is secured as by welding to the outer tube 6 of the barrel. The tube 6 threadedly engages as at a core lock casing 8 which is in turn threaded as Serial No. 746,959.

at 9 to a drill bit 10, the latter being of the usual rotary diamond type. The drill bit 10 is provided with an internal conical bore 11 in which the usual resilient split core lifter 12 is disposed. The core lock casing 8 is provided with a bore 13 which is eccentrically bored as at 1% to form a ledge 15.

Water or mud fluid is adapted to be delivered to the cutting edge of the drill bit 10 through the hollow drill rods 3 from any suitable source and into a bore or chamber 16 formed within the head member l. The lower end of the bore 16 is provided with a reduced central opening 17 which communicates with the interior of the outer tube 6 and the water or mud fluid passes downwardly through this openin through the other tube of the core barrel, and through a series of openings 18 and 19 formed in the core lock 8 and the drill bit 10, respectively. The periphery of the drill bit 10 is fluted as at 20 to permit the flow of fluid along the exterior of the core barrel and upwardly from the hole in the usual manner.

In my improved construction it will be observed that the lower end of the head member 4 is provided on its lower surface adja cent the opening 17 with radially spaced teeth 21 which interlock with teeth 22 formed on the upper surface of a plug member 23. The plug member 23 threadedly engages, as at 24,

the upper end of an inner corereceiving tube 25 which is provided at its lower end with a cylindrical portion 26 of reduced diameter adapted to freely fit in a bore 27 formed in the upper part of the core lock casing 8. The plug 23 is provided with projections 28 on its outer surface which are adapted to guide the upper end of the inner tube 25 within the outer tube 26. The interior of the inner tube 25 is vented by means of a small port 29 formed withinthe plug member 23.

In the use of my improved core barrel it will be noted that during soft drilling the drill bit 10, which is rotated in any suitable manner, cuts out a core of the material being drilled and this core passes through the core lifter-12 and the core lock casing 8 into the inner tube 25 of the core barrel which is held in non-rotative relation by means of the clutch teeth 21, 22. The water or mud fluid then passes from the hollow drill rods 3 into the chamber 16 within the head member through the opening 17 and downwardly around the exterior of the inner tube 25 and through the openings 18, 19 in the core lock casing 8 and the drill it 10, respectively, to wash away the cuttings and to seal the hole. Fluid is consequently prevented from washing over the soft core and the core barrel at that time being used as a double tube barrel. hen it is desired to remove the core from the hole, the core barrel is raised upwardly, by any suitable means, consequently causing the core litter 12 to grip the core and break the latter oli'. The ledge 15 formed within the core lock casing 8 prevents the core from moving downwardly within the core barrel in case that the core litter 12 does not rigidly grip the core. l ihen hard drilling is encountered the core barrel is removed "from the hole and the core lock casing S unthreaded from the lower end of the outer tube G permitting the inner tube 25 to be bodily remo'ed longitudinally from the barrel and the core barrel thereafter being used as the single tube barrel. When the core barrel is useo in this manner, the mud fluid passes from the drill rods 3 into the chamber 16 through the opening 17 and through the interior of the tube 6 around the exterior of the relatively hard core and through the openings 18 and 19 to the cutting edge of the bit.

As a result of my improvement it will herein be noted that I have provided an improved core barrel of the combined single and double tube type especially adapted to use in oil well drilling and which may be utilized in either hard or soft drilling, consequently eliminating the necessity of two separate barrels and decreasing the cost of the device.

WVhile I have in this application specifical ly described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: v

1. In a core drill, an outer core barrel and a bit carried at the inner end thereof, a detachable inner core barrel, a detachable core lock casing secured to said outer barrel and in which said inner barrel is seated, core lifting means carried by said core lock casing, and a sliding interlocking connection between said barrels for preventing relative rotation therebetween.

2. In a core drill, an outer core barrel and a bit carried at the inner end thereof, a detachable inner core barrel, a detachable core lock casing secured to said outer barrel and in which said inner barrel is seated, core litting means carried by said core lock casing, and a sliding interlocking connection between said barrels for preventing relative rotation therebetween, said interlocking connection being releasable purely by straight longitudinal movement, of said inner barrel relative to said outer barrel upon removal of said core lock casing from the latter.

8. In a core'drill, an outer core barrel, an inner core barrel, core lock casing detachably secured to said outer barrel and in which said inner barrel is seated and supported, said inner barrel being freely longitudinally movable from said outer barrel upon removal of said core lock casing from said outer barrel, core lifting means carried by said core lock casing, bit detachably secured to said core lock casing having a core receiving passage, and means for conducting fluid from between said barrels through said core lock casing and through said bit externally of the core passage therein to the bottom of the hole.

4. a core drill, an outer core barrel, an inner core barrel, a core lock casing secured to said outer barrel and in which the lower end of said inner barrel is seated and supportec, core lifting means carried by said core lock casing, a sliding interlocking connection between the upper ends 01" said barrels for preventing relative rotation therebetween, a bit detachably secured to said core loclr casing and having a core receiving passage, and means for conducting fluid from between said barrels through said core lock casing and through said bit externally of said core passage to the bottom of the hole.

5. In a core drill, an outer core barrel, an inner core barrel having a core receiving chamber, a core lock casing secured to said outer barrel and in which said inner barrel is seated and supported, said inner barrel being freely longitudinally movable from said outer barrel upon removal of said core lock casing from said outer barrel, said casing having a core receiving passage, core lifting means carried by said core lock casing, a bit detachably secured to said core lock casing and having a core recei 'ing passage, and means for conducting fluid from between said barrels and through said core lock casin g and bit extern ally of the core receiving passages therein to the bottom of the hole.

6. In a core drill, an outer core barrel, an inner core barrel, a core lock casing secured to said outer barrel and in which said inner barrel is seated, a bit secured to said casing, a core litter carried by said bit, and sup plemental core engaging means carried by said core lock casin 7. In a core drill, a combined single and double tube core barrel comprising concentrio tubes adapted to selectively receive a core, and a core lock casing, core lifting means carried by said core lock casing, cans for slidably interlocking the upper ends of said tubes for preventing relative rotation therebetween, means to seat and support the inner one of said tubes in the upper end of said core lock casing, and a bit detachably secured to said core lock casing.

8. In a core drill, an outer core barrel and a bit carried at the inner end thereof, a detachable inner core barrel, said inner barrel being provided with a closure plug at the upper end thereof, a core lock casing secured to said outer barrel and in which said inner barrel is seated and supported, core lifting means carried by said core lock casing, and means for slidably interlocking said barrels together to prevent relative rotation therebetween including positive locking means carried by said plu 9. In a core drill, an outer core barrel and a bit carried at the inner end thereof, a detachable inner core barrel havinga core receiving chamber, said inner barrel being provided with a closure plug at the upper end thereof, a core lock casing secured to said outer barrel and in which said inner barrel is seated and supported, core lifting means carried by said core lock casing, means for positively slidably interlocking said barrels together to prevent relative rotation therebetween including locking means carried by said plug, and vent means for said core recei'x chamber.

10. In a core drill, an outer core barrel, an inner core barrel, a sliding interlocking connection between said barrels to prevent relative rotation therebetween, a core lock casing carried by said outer barrel and in which said inner barrel is seated and supported, core lifting means carried by said core lock casing, a bit carried by said casing, and means for guiding the upper end of said inner barrel for maintaining said inner barrel in substantial alinement with said outer barrel during insertion of the former barrel within the latter.

11. In a core drill, a combined single and double tube core barrel comprising concentric inner and outer tubes, a core lock casing detachably secured to the outer tube, core liftin means carried by said core lock casing, means for seating the inner one of said tubes in said core lock casing, a bit detachably secured to said core lock casing, said core lock casing forming a coupling between said outer tube and said bit, and supplemental core lifting means carried by said bit.

12. In a core drill, a combined single and double tube core barrel comprising concentric inner and outer tubes adapted to selectively receive a core, a core lock casing detachably secured to the outer tube, core lifting means carried by said core lock casing, means for interlocking the upper ends of said tubes to prevent relative rotation therebetween, means to seat the inner one of said tubes in the upper end of said core lock casmg, a bit detachably secured to said core lock cas1ng,'sa1d core lock casing forming a couplin between said outer barrel and said bit, and supplemental core lifting means earned by said bit.

13.-In a core drill, an outer core barrel, a detachable inner core barrel, a core lock casing detachably secured to said outer barrel and in which said inner barrel is seated, core lifting means carried by said core lock casing, a sliding interlocking connection be tween said barrels for preventing relative rotation therebetween, a bit detachably secured to said core lock casing, said core lock casing forming a coupling betwen said outer tube and said bit, and supplemental core lifting means carried by said bit.

14. In a core drill, an outer core barrel, an inner core barrel, a core lock casing secured to said outer barrel and in which said inner barrel is seated, a sliding interlocking connection between the upper ends of said barrels for preventing relative rotation therebetween, a bit secured to said core lock casing, a core lifter carried by said bit, and supplemental core engaging means carried by said core lock casing.

15. In a core drill, an outer barrel and a bit carried at the inner end thereof, a detachable inner core barrel, detachable means secured to the lower end of said outer barrel and in which the lower end of said inner barrel is seated and supported, and a sliding interlocking connection between the upper ends of said barrels for preventing relative rotation therebetween, said inner barrel being releasable from said outer barrel by straight longitudinal movement relative thereto after said seating means has been detached from said outer barrel.

16. In a corev drill, an outer barrel and a bit carried at the inner end thereof, a detachable inner core barrel, detachable means secured to the lower end of said outer barrel and in which the lower end of said inner barrel is seated and supported, and means for locking the upper ends of said barrels together to prevent rotation of said inner barrel relative to said outer barrel, said locking means being releasable by straight longitudinal movement of said inner barrel relative to said outer barrel after said seating means has been detached from said outer barrel.

17. In a core drill, an outer core barrel and a bit carried at the inner end thereof, a detachable inner core barrel, detachable means secured to the lower end of said outer barrel and in which the lower end of said inner barrel is seated and supported, and locking means comprising clutch teeth carried by the upper ends of said barrels respectively for locking the same together to prevent rotation of said inner barrel relative to said outer barrel, said locking means being releasable by straight longitudinal move ment of said inner barrel relative to said outer barrel after said seating means has been detached from said outer barrel.

In testimony whereof I aifix my signature.

HARRY C. JOHANSEN. 

